All monies we have are savings from before 1 January 2024. When bringing this into Thailand eventually does it require declaring at all or not?

If the money is remitted from pre-2024 savings, it doesn’t need to be declared or filed because it is not a taxable income source. The notable amendment in Order No. P.162/2023 is the clarification added to the first item of Order No. P.161/2023, which stipulates that the new taxation rule does not affect income earned before 2024. This specific exemption provides a transitional period for taxpayers, allowing them to adapt to the new system without the worry of retrospective taxation.

You can learn more about pre-2024 savings in relation to Thailand’s foreign-source income tax by listening to a short podcast here.